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A third praised Robert's understudy and Christian Slater for his 'heartfelt speech' after he expressed concern for his co-star before thanking the audience and asking for their patience with the understudy.

The West End production's social media accounts later said the actor was feeling better, writing: "Thank you for bearing with us this evening.

"We are pleased to report that Robert Glenister is feeling better and tonight’s performance has continued with Mark Carlisle in the role of David Moss."